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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba55d4361bae454fda08aab0faed6a548899935a726698597ab654ef666a04f' 
  AND token = 'ev5DggdeQWm9Dio12lHQRno87U6n8LUyMaC34KdJOGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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