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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa09f655630a3d0b88d705ae3ef7f050c19a30fa4d14d8552e7e0d44f82e304' 
  AND token = '5pn45BrpP+1PgFV6eD/asnOo6eBk1SEoWV9P6CEuAQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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