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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3628c42e35731244601acd6c0c41712e0412b01d80c79ad0869e4eb9d1032550' 
  AND token = 'xgfzHvaliwgKoo6dhwEnIZJk1aRIjZEy/C7+BzCfXnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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