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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c4c6b9e83030e1428efed530f2c7c5c3818dbbdbbcd8cc595ccefaf1d072c9' 
  AND token = 'chWj231GmhMSMiCHYdpXetkMknicixXgTyZTeP3GcxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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