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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9cfd17e4197476246e80b23d924b1aa58b6fd25cb6f6b5e407e00ceb75a763' 
  AND token = 'y4UG1dIlfc9XWeiTI72RkBwn4+2I661cLS7voGNDwJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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