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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b266c4fe1b7a974cd2aa93404ce525c6612c7f1a0fa7545f44334c33e7e4a389' 
  AND token = 'gjgeZ3Bj8rQYLfwgtKFlPfv8R2aEY5vxVAdOLTNr/NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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