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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1febcaf9753708de42627a24161315aaed3b8efb68909e98c7ded0fd7a10bb49' 
  AND token = 'jT63ip4KOHo64Q+VjuxlJDlXBcfl7gHsHRg3tefybD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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