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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2395590a69a04111aebe993391ba7714decd4627c5ac29e647c8113ff91b1cd7' 
  AND token = 'EoybZa0pQzdsFr8cWxEh5p+RNzp6jHZqVQbFOnd0hnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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