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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6f403d3fbcdae70cc9de752e855a67e0ead78f76b33eebdfcca76497ec31d3' 
  AND token = 'HS+CBSLiFlicsSQgC5hOh2yNdRvBUhwR2AQVqloJWLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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