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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ce7e15fc6d7a2f101068e35c08eb19be380f92a54c06b6daf4d06e0b2c98cb' 
  AND token = 'zK4BtDyqXNf8sHwfUTg0sby0QneuQrFr6TdIXnQC+oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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