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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6a622f355fdc39087074d7c7f86749ef2e2a739e50d6a737920f3727beb907' 
  AND token = 'RN9stPszvfqkqYaAWVwc6hBTyCP+gby+EbNqr1YjDoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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