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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07626d4778fb513ad4dbc16b3a4132a04ab9bd829483396397f921134d91b1a' 
  AND token = 'Tij7EAcv5t5ftc/c0Imn7TgkQT+pBsPuu+pp5aujWlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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