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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c39bac6a76fdb642190a7a431811e9fc822c6619d5b048b15326d77553663d4' 
  AND token = 'uX30hjGa/plbBvsMrzOATf8d9mYRZN434dtIWa1D7G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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