SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f58796dffd33d4ea85ca71bb7451928317535849df8b20a6b66d113c780ca4b' 
  AND token = 'G6PA694h65vaS1iXmo4FPFpCpiDhKsRMLjbWHWfJJzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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