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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fad7bb6d9f4b233941e3b68b20c36ba425d8169c71458848913059f15dabf6' 
  AND token = 'ktTcNGINwD8Ju9yykKiaQiFWpFjTxMN687qC5CY27qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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