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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89630f272c2a268030f064103afdd9a7466a42ebdf70d92d198197bd3dc02e8' 
  AND token = 'kRZneFRPKM4BWXdaZydEWLkaHFIO3YwSh9MHeUU8XHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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