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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2034d0e8c1240ae8a2cdf314bfee937828f77fa6ca522040b2f553b7be9b5a90' 
  AND token = 'yc4sZ4EK6zkyRjs0MJfPi4C237iXrwG8fNaeA02Van4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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