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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d9504ba07aef3c6d9a9da765c8d082c8aa524017b47cd0bfb2cf761ca0ac00' 
  AND token = 'xqLA8kmDhYkykGdYjoEcl5N4IcIQehEEHP6p0xB/R/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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