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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3723a231f21f7fc8e0a3c7fa8b58e5d351b83903c4d6121ccdfced1c1f243192' 
  AND token = 'fyL/v9ULjrGvLzoavw+A1V0MZje0nzuQcR+UMKy2srU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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