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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0382c7056f0888a675b19fcd2e817757514f2982e7d28379c089811b1fd1828' 
  AND token = 'HhHad5dDRoA6CUZ8R9ONK0ku3bvPdsgwSuHczFThx+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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