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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbdc473a31f92b7dca4f80556bfc1da65add621c938fd79deb44f9b4806230d' 
  AND token = '7b6uFB7ww1dfupYSa3W2dpCB1tGaq5BoqGcC5hugm2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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