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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3a8939cd49c975dc2149f77683e8ff0a2da75a35d75d06dfd37da115c53ddc' 
  AND token = '0BnW/CYatXJV3dc0GlDGVOYQiTRoatNE4AjwUNBSxuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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