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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31261118056b7b2d9cf54328f15b4ba8e4604dcfc576e608b4c50fe69d4fdc03' 
  AND token = 'mkOQ6akjPlNqBVDeag7J2PVnROsHSxx9WDRC1+wcFIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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