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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabb24a25029df28f4f921d51bb1dbf43392a92a9592af9a10253941ba8ae1a6' 
  AND token = 'wm0ETlFAV5/WhGHBcDD7e7epGmnLaC/u5vok/7g8+Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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