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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98d10f5b0ef2330e4ec697d645755ab43cb19a2a867259a832d3c5394ecf63e' 
  AND token = '80r9UrRn+bjUAU2+ZxJxXt0VaBoxSPedeg4zYOmBL6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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