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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a7559ab23bca715c05944c3db3b3590ecaf2d96e215e05c92bdb9bab1cba74' 
  AND token = 'EzbEcVAPq0uI89A1D8AKQYCE5wJdcSPm7Qn6ymCVXl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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