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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7139183c3a25a0a7106c3f220e6a0f2a43ad9e02cbd836f413f8a99a5bd28e27' 
  AND token = 'eFdVLe6N61TWCYMpsdMdza/4LfsN0K4FkU+LTTJ2vVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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