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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac7890e2d05bfc3a9140e8184e6d250e24dcc3f6b1cb589e1c1633435090d3b' 
  AND token = 'IK1n4ikpntW9wLG+WStr6VtVcB8TqR8l9FLtmhSw8WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}