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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91e85ee33d61013639741354941993d76c62bb25e1d87d89fefedd271667d7c' 
  AND token = 'HW50FoZ83eCSfEIdhtj3r7OhMiGyvkkJ1QVez/1ThKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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