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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433ffcb90fea99a258489bba706eda743092a9afda1b5eb99c507392a1b203e6' 
  AND token = 'ilZsbiFTCvHR1odKwAcZcjCGYaSI/tl3hXTNT/mjJDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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