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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84490e40277c9be03bb28ba4de0a6f2bc1d1efcc4d7607d964f907f765a079b' 
  AND token = 'QtI6cHYIVr9NgpD3pdZBsqdiLYQJrdPmC2pUUxYa7T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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