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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f1472b2c70af1e3f0559f8a2e03cfd28a969a42ba26223230b4f5a9c0e5dc7' 
  AND token = 'LbEM0PJgGWErtXi5t6OwX/O1wAxR3EfsN8sj5XVM1cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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