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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05b543d8745034fab8781e85db05b5203a126f5849f68fdd038e7f79ced6276' 
  AND token = 'dkZ64Z6bv+pu5ceELZ1uIeZgxwj0kYfhc7UwWC4NAFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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