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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4bd57f8f71788b99ca4edb80b1f9da36cc2412f2d0f9eef728f3f017bcc5fc' 
  AND token = 'qTT0hKgVUD6cT1nWK4CcANkcCdoXK9Cv75CxSGXlQck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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