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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f129ef2fb009e4d7fb1553de01060899c33b1525be006f489bb35d3fa27c09d' 
  AND token = '07yt1olcgS6jdAvw54ZdZcxtRyDs82AS3mcMm1YghL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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