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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0aae4cb9290f79cef901cf66ebd27076b30cbce93dd7a3859d0dea822b44ecc' 
  AND token = 'QmhCFrLk4eUCfcGi1IFB1UAjVY89/SnDLjKVc6OBhbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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