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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f232f4156b2e6f2915d7e5f8dd17cd296bfa3cf1f19edb71a35dc84a812946a' 
  AND token = 'hXvMj3xr88eqIjVTQ3cHd6iklh/9SxeYNS25sjQyTh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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