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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41fffa9d99e6e342b0ce28567319bc3934a2298420a07ec8950c39bc8cc5f877' 
  AND token = 'TeIoYg/tfkF7eFD/cDf0j2Ce1RvhCWe/5+Yk8tSDIEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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