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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c0626852a7024f6ad02720112e563e24176448a049c5d8904be806aedb15eb' 
  AND token = 'mqpD/rFXeZtph4UyXzjqx/fR1P06CM8T5LhIcvmPuDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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