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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7007012fd7db364eae2277e4c878b6c32bf450cf564f13e73c9e0d7dbfd08a85' 
  AND token = 'ijR6R/EGuox+MX7Y86aDFO7glEpZ+4w7vA+pDyxok0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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