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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2f940f612d8498cd35b54e0e9df6a90ab5424aac6ea4f292ec82d94f6dc607' 
  AND token = 'OTiNQKq5OXmPXAN8JhRf4V6jHw4Zs0uWLMoSwx4u38Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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