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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df117dd6c2e92c5a10ba00c3d50d42d154389dfd621d6d0b0e45ce5b0c83754' 
  AND token = '5UPWt8nRK5EMj+SKcfAW737JJMljhJXmxT6mKvtfGzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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