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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9972dd71b65f63095a834ca0f4685668ae51aa20d9f75f850722b0c99acd25ad' 
  AND token = '01l+p19XrXfaOGgcotKlnPDk+cFHwImPw+NKVogmnqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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