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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4c325cb0c7827c8105881b809aab114fc6b21888fb8249ee4401c0813bc430' 
  AND token = '1oG+jxM1dx/jQfEtVICvyt66NtvnidBsLI+O26M6ud8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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