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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1588ffde1fe18e90f21b15c35f168bafb90b9e68446617737825c3ced6ada83a' 
  AND token = 'r8E/oF7adbeccZ6q5gqYanox4+t8iBc3xvkiIRLSh9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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