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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f87215280995d7bb41cb3316e22213b0f9d15abd75f2e6351148cca3a95e201' 
  AND token = '66FlDTFv6WRI1ga2v6agBMhO4hUzxiTU6mjyJztpQvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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