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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eeaae876dc281d3705817c51bb73b86d28b5225a57a4dedc9c2b936c39c29a7' 
  AND token = '2MUxSkFV+ws5OvBGOeMdiQeC+2tu6gWqlXsz4ve2MXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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