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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde3fd67c2b2e62db0972d1e39c0eb99e9b76d5ce696517da3f918a190637be2' 
  AND token = '8qPwMqMtBk9ixZa8EftMHrXHEzOaLNI36QojNDv7wbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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