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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8b473605124533da1384a6afeabb15625972ae2da8872c0a17f76ae68fa0c8' 
  AND token = '13VlCHzch5B5fcptSbg4FcJ1kGihBrOEZ9kDC9e/Zd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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