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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3576d94cdb6a60b1a84ded7b1e8888a8af428d335c4303332f75c465f3196ee4' 
  AND token = '/NHaNMcIktL529bd/OfCkplVdKdCOS73BkSUKkVUNOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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