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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e87026b7ecf4ffdbc8b260109bc2f3b7abb5064b015066fc462eb4b15c442aa' 
  AND token = '7QqYU62ojTJsxpuJc8hWxbTMdIjSOijIwY3WiPVIQKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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