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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea9ea16315edc9f338890b45c62571fda9476c7e86a3444b8544d1f36fe66d9' 
  AND token = '5NpX6SvbHlqC5nuWKTOmMNNx8BuDBcegC5FHeb3yn1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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