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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d34d4232b5520066279a7025d9e622c1a0a6bc7e5af74f3056160b625cfc8e3' 
  AND token = 'dlBO75Nx7JkpryuGd6eBn6nDnPdv0zg38WM3xwF18e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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