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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72fbe99544fce012be4713e953b6d60e99beb5ad4190db159b2806064b55ff8' 
  AND token = 'R8/li+2Telr9Hnb9pNlQH6B/k2Okgq8Ci7Odj9bpHqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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