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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2438c06a6dbfed8d0723b5ecc6fe266ab022d41a2d2a7357bb9f9e0dd658a0ad' 
  AND token = 'gmR1yLDB7nF48ft8TZjz9WRizPNpcYOJVtQeJqrcJxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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