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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b07b9aefb64a6a53b1f22d06139b8d09f89fc6b331c512146c1069e011458d' 
  AND token = 'MIood4qmqaeS8cBU6nN6ub5oVVOa/lmBjeDOMSBBN2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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