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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd798f93ffde5da9a1018a6d85a6655232163eb307f082ad17b28575eb547675a' 
  AND token = 'pMxRtg85FY7kZKk/aNowTKqKFbfbYwA0TcVIhukykhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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