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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f42375df98942956f1993c7c5ca251c30d23b4a8014d24729f7bada0512a6c' 
  AND token = 'oHNQfIvWiAN4CBq/jlEafjVx2ASXCaZBM+TtOrBkQHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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