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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0800dbc811eae25457753910582029191bc0d05f3cef459e8a35b96803688104' 
  AND token = '+ItbcVXiasHWp3zv+hhefrBS0HFiG+2Dq8Sa5FKbgp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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