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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd130357e6efe4b1899c7e8efe18a8eb845ea9c44696da73f981c1ea539d6ebec' 
  AND token = 'KvVtodlgHIg0ZhnghBOLvbtuKPBixs+AXKKJNot/3y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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