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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7faeabe124e6e4a8dd7076c54a59298bd7305cf0c636d014694e73f27c21f73' 
  AND token = 'jzPZYi7sulS1nn99X5AouB7elbTBkUpRVQkI3XPgpRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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