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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a816a28752d6bf549b8387319accd63adc359edfabc64983154f362699a79e' 
  AND token = '0VVEf2lEkIGaAfPX7x12O06/4IWDvRvR9fR/1IK8/xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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