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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3456053646e3997dcedeae557685f5a2b9c7560ce2c203517fe9a04213f618e0' 
  AND token = '2tk0WMSg8l32yigbQeTII+ud9CVprIKkqccVLZ7xpyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00180

JSON explain

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