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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f392546e94a18ffd858fa24f5eeca4d7fb4385926c78841c687a00b6dd97ab85' 
  AND token = 'eWHo2SnC0L8eAJGq8T4H7rz9vDUVbft1er5OoV0modE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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