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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83eb2ac2a344676c6b5c5d3eac79945bc4481541c91444c0067edd0e296063db' 
  AND token = 'cj4KpblNs4/UqHI/X5afzIfeffq5HatVIvMrABq862Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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