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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1276e77740d7b755f1e4d0567f261dae4d40697f53a7689c83b73386e7104d93' 
  AND token = 'QNW9oj4c1I7DLpIVhzqF41ffn6MChuApGA7+EgLr9RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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