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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57458e1aeed3355772aad0a26354f0bb9ab15e7780b333d34e85aa57e374127' 
  AND token = 'CLbT4yccc80L1jJK3ONIiZWk2XHbPgqmpTl334eJK0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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