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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f6be07958f1944617a8a6fa34206e5fd443c0c9cda436650e1d9d63149d728' 
  AND token = 'MM1Haj0vTrCAJm+BAAfrf9xC1sLi577rTgUwgIMV0FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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