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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93552611e6f730b3bca55eafedcaab647f6be7cdb2a6a3dc21ac1978a918ccb7' 
  AND token = '4gNy8xbTm5b9tAydpBSCntzSYxYZoLYhO6UIOIUrzIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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