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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2db486f8e471e090fe9e1a9bcfbaeb0f8ea46593dbb8f689f404f2255ff1f7d' 
  AND token = '53KA+YiPvtOY+lGXsCZX5iQoUDIu5LH2g6jeUi5Jv4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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