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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49d210b5c943c0c558656f4d2ab040d8194de448f71fc17ff319122b9d4bd56e' 
  AND token = 'ZjMocGQQMHBGaSmGEpjr6PSuRp5bPFMSP9J9kZazl3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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