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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f11ad0f9e56ba3d1131ab9999f5af2ac0965631a439b708d6944ddf9b979eb' 
  AND token = 'TOXsjI5UNKl/8rKLNz2cHmnjPOFjCUg0kCAci/tOjdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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