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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6de29d4fb96c8f0ac2a4fe899c3f0cba81bd87665eed8d8989f223c132d5d84' 
  AND token = '8UWy9+E6ND5WpUNsP77tVenmkiI2hQQs7K1Wx6Td+0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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