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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381adcd77919232e111d61a0a18727518655a5e0519221c21b379a41c73a31ba' 
  AND token = '/EC+IUiOEfi1I/fHINWboPAtubr3iK2w386kfSzaoK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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